Question

For the balanced equation shown below, how many moles of o2 will react with 0.3020 moles of co2? 2c2h5oh + 6o2 → 4co2 + 6h2o question 9 options:

Answer 1

Answer: 0.453 moles

Explanation: $2C_2H_5OH+6O_2\rightarrow 4CO_2+6H_2O$

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

As seen from the balanced chemical equation,

4 moles of $CO_2$ are produced from= 6 moles of $O_2$

Thus 0.3020 moles of $CO_2$ are produced from=$\frac{6}{4}\times 0.3020=0.453$ moles of $O_2$

Answer 2

The balanced reaction for combustion is as follows ;
2C₂H₅OH + 6O₂ ---> 4CO₂ + 6H₂O
the stoichiometry of C₂H₅OH to O₂ is 2:6
that means 2 mol of C₂H₅OH reacts with 6 mol of O₂.
when 1 mol of C₂H₅OH reacts with 6/2 mol of O₂,
then 0.3020 mol of C₂H₅OH reacts with - 6/2 x 0.3020
therefore number of O₂ moles reacted = 0.91 mol